Dec. 8, 2021, 7:43 a.m.
(ABC News) Pfizer says a booster dose of its COVID-19 vaccine may protect against the new omicron variant
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Dec. 8, 2021, 7:43 a.m.
(ABC News) Pfizer says a booster dose of its COVID-19 vaccine may protect against the new omicron variant
Login to grade this article.